Think of it this way...40psi of water pressure, you will get a LOT more water from a fire hose than a garden hose.

but, you can only drink a mouthful at a time.
a faucet will look the same hooked up to either.
lil different with compressible air.

im imagining 2 huge air tanks filling ballons, at same psi.
no matter the cfm of dif compressors, balloons fill same.
bottleneck of valve. and of vol dif betwixt tank/balloon
filling directly from compressor, cfm would matter, but matters less as valve gets smaller, as as size of balloon rel to tank dec.

im thinking the ratio of vol of intake tract air to cyl air matters, as well as restriction at valve.